Re: How to retrieve data ?

FWIW, I find the rdfds lib from XULPlanet to be a helpful wrapper:

   http://xulplanet.com/downloads/rdfds/

For example, it makes it easy to serialize your ds to a string, so you 
can confirm that the parsing works correctly.  I also find its API more 
convenient.

Looking at your example, did you leave out the "#" in the property's 
URL?  The NS declaration in the RDF is:

   xmlns:MYINFOS="http://www.myurl.com/rdf#"

...but in JS:

   "http://www.myurl.com/myinfos/description"

--Paul

KDO wrote:
> Hi all,
> 
> I have some trouble to retrieve data from an RDF file. The structure of my
> RDF looks like this:
> 
> <?xml version="1.0"?>
> <!DOCTYPE overlay SYSTEM "chrome://foxguardian/locale/foxguardian.dtd">
> <RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> 	xmlns:MYINFOS="http://www.myurl.com/rdf#">
> 	
> <RDF:Seq RDF:about="http://www.myurl.com/myinfos">
> 	<RDF:li>
> 	<RDF:Description about="http://www.myurl.com/myinfos/ADMIN">
> 		<MYINFOS:name>ADMIN</MYINFOS:name>
> 		<MYINFOS:description>short description for admin</MYINFOS:description>
> 	</RDF:Description>
> 	</RDF:li>
> 	<RDF:li>
> 	<RDF:Description about="http://www.myurl.com/myinfos/USER">
> 		<MYINFOS:name>USER</MYINFOS:name>
> 		<MYINFOS:description>short description for user</MYINFOS:description>
> 	</RDF:Description>
> 	</RDF:li>
> </RDF:Seq>
> </RDF:RDF>
> 
> i have a JS function whith a string param which can be 'ADMIN' or 'USER'
> and i want to retrieve the 'description' value.
> 
> My JS function looks like this :
> 
> function getDescription(usertype) {
>   var rdfService = Components.classes["@mozilla.org/rdf/rdf-service;1"].
>       getService(Components.interfaces.nsIRDFService);
>  
>   var infos =  rdfService.GetResource("http://www.myurl.com/myinfos/"+usertype);
>  
>   var desc = rdfService.GetResource("http://www.myurl.com/myinfos/description");
>   
>   var target = dsource.GetTarget(infos, desc, true);
>  
>   alert(target);
> }
> but target is always null. What's wrong ?
> 
> NB: dsource has been retrieve during onload event of my xul form
> 
> 
> KDO